One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,6)(3,7,4,8)(9,10,12,13)(11,15,16,14)(17,18,21,24)(19,22,25,29)(20,27,28,23)(26,32,31,30)(2,6)(7,8)(10,13)(14,15)(17,19,21,25)(18,22,24,29)(20,26,28,31)(23,30,27,32)(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,14,13,15)(19,25)(20,28)(22,29)(23,27)(11,16)(14,15)(19,25)(22,29)(26,31)(30,32) involution — undirected(17,20,21,28)(18,23,24,27)(19,26,25,31)(22,30,29,32)(1,4,5,3)(2,8,6,7)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.